Commutator-brush.



V. G. APPLE.

GOMMUTATOR BRUSH.

APPLICATION FILED JULY '1, 1906.

936,692. Patented Oct. 12,1909.

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UNITED STATES PATENT OFFICE.

VINCENT G. APPLE, or DAYTON, omo.

COMMUTATOR-BRUSH.

Specification of Letters Patent.. I

Patented Oct. 12, 1909.

Application inea July'z, i906. seriai No. 325,054.

The object of my invention is to provide a brush for dynamo-electric-machines, c0111- posed of a conglomerate, electrically conductive material, such as carbon, graphite or the like, molded in shape and inclosing a more highly conducting attenuateY or thin metal sheet, or fabric, such as copper gauze, or the like, uniformly distributed across the wearing internal surface of the brush, thereby decreasing the electrical resistance of4 the brush as a result of the presence of the attenuate sheet metal conducting part, and producing a structure that will wear evenly and without cutting grooves in the com- 'mutaton Another object of my inventionis to improve the mode of construction of such brushes, by casting the carbon parts in'suitable lengths and subsequently putting them together by proper means, at the same time inclosing the metal member contorted into the proper'coniguration to `correspond with the internal surfaces of the carbon pieces.

Another object of my .invention is to provide an inclosing metallic cap, placed over the end of the composite brush, for the purpose of more securely vholding the parts thereof in secure position, and as a means by which electrical connection maybe made to the structure. n

These and other objects will become apparent to Athose persons skilled in the art from the description hereinafter.

In the drawings: Figure 1 is a side elevation of lmy brush. Fig. 2 is a vertical secposition of I gether. l y In all the views the same characters of tion t-aken on line 2 2 of Fig. 3. Fig. 3 is a cross section taken on line 3-3 of Fig. 2. Fig. 4 shows one form which the metallic fabric takes when inclosed between the surfaces of the two carbon blocks, forming the composite brush. Fig. 5 shows the relative the parts before being put toreference indicate similar parts.

Fig. 1 shows the complete structure after ithas been finished, in the manner hereafter described. Two pieces of carbon, graphite, or like material, 10, and 10 are cast in shape, in cross section, similar to that shown in Fig. 5. They are preferably duplicates of each other, or parts of the same casting, so that they may be placed in the relation,with reference to-each other, as shown in Fig. v3.'

A piece yof sheet metal, or fabric, 11, referably copper wire cloth, composed o fine copper or other suitable wire, is contortedinto the shape shown in Figs. 4; and 5. It is preferably staggered across and back of the interior of the brush, to make electrical contact with maximum carbon surface, and so as to distribute the metal in thin lamina or sheets throughout the interior of the struc-` ture.

The exterior surfaces of the carbon plates 10, 10', are preferably copperplated, as shown exaggeratedly at 12, 12 respectively.

A metal inclosing cap 13, extends 4partway down over the surface of the brush, and

eor

is connected by soldering or brazing tothe Y gauze member 11, at points 14, 14.

The thickness of the metal plating 12, 12,

is shown exaggerated in the drawing; inl

practice it is extremely thin, but is sufficient to substantially complete electrical contact with all of the exterior surface ofthe said carbon parts.

, 15 is a pig-tail connected to the cap 13, the other terminal of which may be appropriately connected to the metallic brush holder, thereby completing and maintaining the electric circuit between the said brush holder and brush.

After the carbon pieces have been molded, in substantially the form shown in Fig. 5, or in a form which will accomplish substantially the same results, the metal sheet or fabric 11, is contorted into a configuration `which will correspond to the interior corrutively, and the longitudinal .edges of the sheet 11, may be 'soldered or brazed together, to hold all of the parts in united position. The cap 13 is then placed over the end of lli the structure 'tobe farthest removed from the commutat'or, 'and is soldered to the outside coating 12, l2 and also to the interior member ll.

It is evident that the members 1Q, 10 and lengths, for the purpose for which they are to be used.

Any convenient means, such as cement, solder, brazing or the like may be employed for holding the component parts of the brush in their proper relation as a completed structure.

While I have shown and described a single embodiment of my invention, it is apparent that considerable variation may be made from the disclosure without departing from the spirit and scope of the claim.

Having thus described my invention, what I claim and desire to secure by Letters Patent, of the United States, is:

In a commutator brush, the combination of two, duplicate, carbon blocks, forming opposite sides of a composite structure, and having projections arranged to intert with each other to form a joint of crenelated outline extending transversely across the composite structure, in end presentation, and a continuous piece of thin metal of similar crenelated contour arranged between the car-4 

